1649599380 has 288 divisors, whose sum is σ = 6189805440. Its totient is φ = 349608960.

The previous prime is 1649599339. The next prime is 1649599409. The reversal of 1649599380 is 839959461.

1649599380 is a `hidden beast` number, since 1 + 6 + 49 + 599 + 3 + 8 + 0 = 666.

It is a super-2 number, since 2×1649599380² = 5442356228992768800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 487374 + ... + 490746.

It is an arithmetic number, because the mean of its divisors is an integer number (21492380).

Almost surely, 2^1649599380 is an apocalyptic number.

1649599380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649599380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3094902720).

1649599380 is an abundant number, since it is smaller than the sum of its proper divisors (4540206060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1649599380 is a wasteful number, since it uses less digits than its factorization.

1649599380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431 (or 3426 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 1649599380 is about 40615.2604325025. The cubic root of 1649599380 is about 1181.5701065782.

The spelling of 1649599380 in words is "one billion, six hundred forty-nine million, five hundred ninety-nine thousand, three hundred eighty".